Furnace Control Board Fuse

Should i check amp draw on compressor and both fan motors.

Furnace control board fuse. Furnace or ac control board troubleshooting. This will blow the fuse on the control board causing the draft inducer to not start which then stops the rest of the furnace functions from working properly. If you have a gas furnace one of the valves may be failing. I removed all the wires going to my thermostat and it would not blow the fuse when powered on.

The guy has a new condensing unit installed last year. If the fuse didn t blow it meant the. Diyers often try and handle things on their own. Electric furnace problems can be frustrating especially when they come at the worst time.

It isn t the hsi inducer or blower motor as these are all high voltage parts not low voltage. If the fuse blows when you have no low voltage wires hooked to the furnace then you have an internal problem like a bad limit gas valve connection or control board. I replaced the original control board with a honeywell st9120u1011 universal control board about two years ago after the original one blew. Its just being used for cooling right now.

I turned off the input power and attached terminal r 24 vac power to thermostat and the fuse blew. When a valve is unable to open and close properly it can sometimes heat up causing an electrical short that blows a fuse. Sometimes your furnace may seem like it has blown a fuse but it is actually suffering from loose wire connections. He just called and told me fuse is blown again.

Here s how to diagnose a low voltage short. I did a recent service call and the 5 amp fuse in the circuit board on the furnace was blown. Is your air conditioner or furnace not turning on or p. If the fuse keeps popping in your air conditioner you have a 24 volt short.

Electric furnace thermostat control wire. If someone pokes around your furnace and isn t careful they may loosen wires from the furnace s wire frame causing them to short and blow a fuse on the control board. Your furnace s control board has a separate fuse that protects it from getting too hot. My furnace is a concord model cg90ub.

Can you guys point me in right direction to figure this one out. Do you suspect that your furnace ac control board is bad.